Door threshold



FIG. 1 is an end view of the door threshold showing my new design;

FIG. 2 is a top view of the door threshold showing my design;

FIG. 3 is a bottom view of the door threshold showing my design;

FIG. 4 is a side view of the door threshold showing my design;

FIG. 5 is an opposite side view of the door threshold showing my design; and,

FIG. 6 is a perspective view of the door threshold showing my design. 

The ornamental design for an door threshold, as shown. 